2115511345 has 4 divisors (see below), whose sum is σ = 2538613620. Its totient is φ = 1692409072.

The previous prime is 2115511327. The next prime is 2115511367. The reversal of 2115511345 is 5431155112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1529435664 + 586075681 = 39108^2 + 24209^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115511345 - 2¹³ = 2115503153 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211551130 + ... + 211551139.

It is an arithmetic number, because the mean of its divisors is an integer number (634653405).

Almost surely, 2^2115511345 is an apocalyptic number.

It is an amenable number.

2115511345 is a deficient number, since it is larger than the sum of its proper divisors (423102275).

2115511345 is an equidigital number, since it uses as much as digits as its factorization.

2115511345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423102274.

The product of its digits is 3000, while the sum is 28.

The square root of 2115511345 is about 45994.6882259245. The cubic root of 2115511345 is about 1283.7243711200.

Adding to 2115511345 its reverse (5431155112), we get a palindrome (7546666457).

The spelling of 2115511345 in words is "two billion, one hundred fifteen million, five hundred eleven thousand, three hundred forty-five".